Actual source code: ex300.c
2: static char help[] = "Show MatShift BUG happening after copying a matrix with no rows on a process";
3: /*
4: Contributed by: Eric Chamberland
5: */
6: #include <petscmat.h>
8: /* DEFINE this to turn on/off the bug: */
9: #define SET_2nd_PROC_TO_HAVE_NO_LOCAL_LINES
11: int main(int argc,char **args)
12: {
13: Mat C;
14: PetscInt i,m = 3;
15: PetscMPIInt rank,size;
16: PetscErrorCode ierr;
17: PetscScalar v;
18: Mat lMatA;
19: PetscInt locallines;
20: PetscInt d_nnz[3] = {0,0,0};
21: PetscInt o_nnz[3] = {0,0,0};
23: PetscInitialize(&argc,&args,(char*)0,help);if (ierr) return ierr;
24: MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
25: MPI_Comm_size(PETSC_COMM_WORLD,&size);
27: if (2 != size) SETERRQ(PETSC_COMM_WORLD,PETSC_ERR_ARG_INCOMP,"Relevant with 2 processes only");
28: MatCreate(PETSC_COMM_WORLD,&C);
30: #ifdef SET_2nd_PROC_TO_HAVE_NO_LOCAL_LINES
31: if (0 == rank) {
32: locallines = m;
33: d_nnz[0] = 1;
34: d_nnz[1] = 1;
35: d_nnz[2] = 1;
36: } else {
37: locallines = 0;
38: }
39: #else
40: if (0 == rank) {
41: locallines = m-1;
42: d_nnz[0] = 1;
43: d_nnz[1] = 1;
44: } else {
45: locallines = 1;
46: d_nnz[0] = 1;
47: }
48: #endif
50: MatSetSizes(C,locallines,locallines,m,m);
51: MatSetFromOptions(C);
52: MatXAIJSetPreallocation(C,1,d_nnz,o_nnz,NULL,NULL);
54: v = 2;
55: /* Assembly on the diagonal: */
56: for (i=0; i<m; i++) {
57: MatSetValues(C,1,&i,1,&i,&v,ADD_VALUES);
58: }
59: MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY);
60: MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY);
61: MatSetOption(C,MAT_NEW_NONZERO_LOCATION_ERR,PETSC_TRUE);
62: MatSetOption(C, MAT_KEEP_NONZERO_PATTERN, PETSC_TRUE);
63: MatView(C,PETSC_VIEWER_STDOUT_WORLD);
64: MatConvert(C,MATSAME, MAT_INITIAL_MATRIX, &lMatA);
65: MatView(lMatA,PETSC_VIEWER_STDOUT_WORLD);
67: MatShift(lMatA,-1.0);
69: MatDestroy(&lMatA);
70: MatDestroy(&C);
71: PetscFinalize();
72: return ierr;
73: }
75: /*TEST
77: test:
78: nsize: 2
80: TEST*/